Mexico: 12 dead in massacre at Ciudad Juarez party

/ AP

Mexican federal police officers stand outside a home after the exterior gate was covered with a plastic tarp in the northern city of Ciudad Juarez, Mexico, late Friday Oct. 22, 2010. At least 13 young people were shot dead and 15 wounded in an attack on this house during a party in Ciudad Juarez, the second such massacre in less than a week in the violent border city. (AP Photo/Raymundo Ruiz)

Mexican federal police officers stand outside a home after the exterior gate was covered with a plastic tarp in the northern city of Ciudad Juarez, Mexico, late Friday Oct. 22, 2010. At least 13 young people were shot dead and 15 wounded in an attack on this house during a party in Ciudad Juarez, the second such massacre in less than a week in the violent border city. (AP Photo/Raymundo Ruiz) (/ AP)

The Associated Press

/ AP

Map shows location of a shooting at a party in Ciudad Juarez, Mexico, that killed at least 12 youths

Map shows location of a shooting at a party in Ciudad Juarez, Mexico, that killed at least 12 youths (/ AP)

/ AP

A forensic worker snaps a picture of a dead man inside a home in the northern city of Ciudad Juarez, Mexico, late Friday Oct. 22, 2010. At least 13 young people were shot dead and 15 wounded in an attack on this house during a party in Ciudad Juarez, the second such massacre in less than a week in the violent border city. (AP Photo/Raymundo Ruiz)

A forensic worker snaps a picture of a dead man inside a home in the northern city of Ciudad Juarez, Mexico, late Friday Oct. 22, 2010. At least 13 young people were shot dead and 15 wounded in an attack on this house during a party in Ciudad Juarez, the second such massacre in less than a week in the violent border city. (AP Photo/Raymundo Ruiz) (/ AP)

At least 13 young people were shot dead and 15 wounded in an attack on a house party in Ciudad Juarez, the second such massacre in less than a week in the violent city bordering Texas.

Gunmen in three cars drove up to the home around 11 p.m. Friday and began shooting, Chihuahua state prosecutors spokesman Fidel Banuelos said Saturday.

The dead were aged 14 to 20, Banuelos said, and a 9-year-old child was also gravely wounded.

Police found 70 bullet casings from assault weapons typically used by drug gangs.

The attackers escaped, and there have been no arrests.

Last Sunday, gunmen stormed two homes in Ciudad Juarez, killing seven at a party and two more in another house nearby. Police have not named any suspects or given a possible motive.

Friday night's killings took place near the working class neighborhood that was the site of another house party massacre nine months ago, in which 15 people were slain, most of them teenagers.

The January massacre sparked outrage in the city, especially after officials called it a fight between rival gangs when most of the victims were students, some student athletes.

President Felipe Calderon's government vowed to implement a new plan to improve law enforcement in Ciudad Juarez and address the social ills feeding organized crime after the January attack.

The city across from El Paso, has become one of the world's deadliest amid a turf war between the Sinaloa and Juarez drug cartels. More than 2,000 people have been killed in Ciudad Juarez this year.